you need to learn how to fix a flat if you're going to ride in any serious fashion. it's not hard to do and it's kinda irresponsible to rely on a cell phone. "honey can you drive 20 miles to pick me up, i don't have the ability to fix my flat tire even though it only takes minutes and a 6 year old could do it, so take an hour and waste some gas and bail me out"....
see what i'm sayin?